python时间时分秒与秒数的互相转换

一：时间转成秒数

st = "08:30:30"
et = "9:33:33"

#方法一
def t2s(t):
    h,m,s = t.strip().split(":")
    return int(h) * 3600 + int(m) * 60 + int(s)

print(t2s(st))

#方法二
import datetime
var = ("hours","minutes","seconds")
time2sec = lambda x:int(datetime.timedelta(**{k:int(v) for k,v in zip(var,x.strip().split(":"))}).total_seconds())

print(time2sec(st))

stackoverflow.com上还有更多的写法

http://stackoverflow.com/questions/10663720/converting-a-time-string-to-seconds-in-python
http://stackoverflow.com/questions/6402812/how-to-convert-an-hmmss-time-string-to-seconds-in-python

二:秒数转成时分秒:

下面的方法是从stackoverflow上抄过来的。
http://stackoverflow.com/questions/775049/python-time-seconds-to-hms

m, s = divmod(seconds, 60)
h, m = divmod(m, 60)
print ("%02d:%02d:%02d" % (h, m, s))